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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import javax.swing.*;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here	import javax.swing.*;
 
 
    List<JButton> list = new ArrayList<JButton>();
    JLabel label = new JLabel("Brainbench");
    list.add(label);
    System.out.println(list);
 
 
	}
}

Main.java:17: error: no suitable method found for add(JLabel)
    list.add(label);
        ^
    method List.add(int,JButton) is not applicable
      (actual and formal argument lists differ in length)
    method List.add(JButton) is not applicable
      (actual argument JLabel cannot be converted to JButton by method invocation conversion)
1 error

Standard output is empty